kalkwasser hot or cold water?

so when I mix my kalkwasser I have been mixing it with warmer water then topping the rest of the container with room temp water, but I just read somthing that said it absorbs better with cold water so which one is it?

 

anything mixes better in warmer water..... molecules in water are more compact in colder temps..... think about it.... ice is solid.... steam is vapor
like mixing sugar in iced tea vs hot tea.

 

that why I have always done it in warm water, i thought there may have been a chance someone knew somthing that didn't

 

How are you heating your RO/DI water???? Please tell me your not mixing with tap water.

 

I read somewhere that kalk actually is more soluble in cold water as well, don't recall the source though.

 

i dont see how it would be more soluble in cold water... that goes against almost all thermodynamically favorable theories!
edit: actually on second thought cooler might be better! The precipitate that forms is the major product... then heating it will form more thermo product (solid stuff on bottom), and take away from the kinetic product (aqueous part)

but if you want to get about triple the calcium concentration out of your kalk mix, add a small amount of vinegar. The acetic acid does an amazing job of pulling the calcium out of the precipitate from the bottom and into the aqueous solution that you use!

 

Calcium hydroxide AND calcium oxide dissolve more in cold water than warm or hot. (source Randy Holmes-Farley)

 

I did a quick search and it's mentioned here.
The Degradation of Limewater in Air by Randy Holmes-Farley - Reefkeeping.com

He doesn't explain why or anything and maybe I'm misinterpreting it, that's just how I read it. If someone has a better explanation please feel free to correct.

 

to easily understand the reaction that takes place you can look at it this way:
mixing water and kalk powder together will form a product. What if this product is actually a combination of two separate types of chemicals, a solid one and a liquid one.
the solid part of the product is the "thermodynamic product". meaning that at higher temperatures more solid would form.
the liquid part of the product is the "kinetic product". Meaning that in the lack of heat more liquid products will form from the original water and kalk powder.

since we are more interested in the liquid product then allowing the reaction to proceed at lower temperatures will cause more "kinetic" or liquid to form. hope this helps

 

Ca DOES dissolve better in cooler temps... RHF said it in multiple articles, I have read it in chemisty books and see it for myself dosing both Ca(OH)2 and CaCl2..